sc1153 Semtech Corporation, sc1153 Datasheet

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sc1153

Manufacturer Part Number
sc1153
Description
Programmable Synchronous Dc/dc Controller For Advanced Processors
Manufacturer
Semtech Corporation
Datasheet

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PRELIMINARY - October 3, 2000
DESCRIPTION
The SC1153 is a low-cost, full featured, synchronous
voltage-mode controller designed for use in single
ended power supply applications where efficiency is of
primary concern. Synchronous operation allows for the
elimination of heat sinks in many applications. The
SC1153 is ideal for implementing DC/DC converters
needed to power advanced microprocessors, such as
Pentium
figurations. Internal level-shift, high-side drive circuitry,
and preset shoot-thru control, allows for use of inex-
pensive n-channel power switches.
SC1153 features include an integrated 5-bit VID DAC,
temperature compensated voltage reference, triangle
wave oscillator, current limit comparator, frequency
shift over-current protection, and an accessible, inter-
nally compensated error amplifier. Power good signal-
ing, logic compatible shutdown, and over voltage pro-
tection are also provided.
The SC1153 operates at a fixed 200KHz, providing an
optimum compromise between efficiency, external
component size, and cost.
PIN CONFIGURATION
© 2000 SEMTECH CORP.
®
lll, in both single and multiple processor con-
(20-Pin SOIC)
Top View
PROGRAMMABLE SYNCHRONOUS DC/DC
CONTROLLER FOR ADVANCED PROCESSORS
PWRGOOD
VOSENSE
BLOCK DIAGRAM
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
OVP
VID4
VID3
VID2
VID1
VID0
OPEN COLLECTORS
VCC
1.25V REF
D/A
VCC CS-
FEATURES
APPLICATIONS
ORDERING INFORMATION
Note:
(1) Only available in tape and reel packaging. A reel
contains 1000 devices.
SC1153CSW.TR
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652 MITCHELL ROAD NEWBURY PARK CA 91320
Low cost / full featured
Synchronous operation
5 Bit VID programmable output
On-chip power good and OVP functions
Designed to meet Intel VRM 8.4 (Pentium
1.3V to 3.5V Range, 1% tolerance
Pentium
Multiple Microprocessor Supplies
Voltage Regulator Modules (VRM)
Programmable Power Supplies
High Efficiency DC/DC Conversion
DEVICE
70mV
CS+
OSCILLATOR
200kHz
ERROR
AMP
CURRENT LIMIT
®
(1)
IlI Core Supply
GND
Pentium is a registered trademark of Intel Corporation
R
S
PACKAGE
Q
SO-20
SHUTDOWN
TEMP. RANGE (T
SHOOT-THRU
SYNCHRONOUS
CONTROL
FET DRIVE
UPPER FET
LEVEL SHIFT
AND DRIVE
0 - 125°C
SC1153
®
IlI)
BSTH
DH
PGNDH
BSTL
DL
PGNDL
J
1
)

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sc1153 Summary of contents

Page 1

... Power good signal- ing, logic compatible shutdown, and over voltage pro- tection are also provided. The SC1153 operates at a fixed 200KHz, providing an optimum compromise between efficiency, external component size, and cost. PIN CONFIGURATION ...

Page 2

... CS(-)) < 60mV CONDITIONS (1) = 5.0 (1) ( 4.5V PGND = 4.5V PGND = 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1153 MIN TYP MAX UNITS See Output Voltage Table ...

Page 3

... Vcc for Low Side Driver (Boost) Vcc for High Side Driver (Boost) Logic Low shuts down the converter Top end of internal feedback chain Programming Input (MSB) Programming Input Programming Input Programming Input Programming Input (LSB) 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1153 within 10% of setpoint O 3 ...

Page 4

... Various 8 Turns 16AWG on MICROMETALS T50-52D core See notes FET selection requires trade-off between efficiency and cost. Absolute maximum R IRC OAR-1 Series Various Various Various Various SEMTECH 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1153 C10 5mOhm 1000uF 1000uF 1000uF + + + ...

Page 5

... MITCHELL ROAD NEWBURY PARK CA 91320 SC1153 = 25°C J MIN TYP MAX UNITS 1.287 1.300 1.313 V 1.336 1.350 1.364 1.386 1.400 1.414 1.435 1.450 1 ...

Page 6

... PRELIMINARY - October 3, 2000 CHARACTERISTIC CURVES SC1153 Efficiency in Application Circuit (Figure 1). 100% 95% 90% 85% 80% 75% 70 SC1153 Regulation in Application Circuit (Figure 1 -10 -15 -20 - Output Current (Amps) © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS Vo=3.5V 3.0V 2.5V 1.8V 2. Output Current (Amps) ...

Page 7

... The latch is reset at the start of each oscillator period. The PWRGOOD and OVP signals are derived from the voltage at the VOSENSE pin by comparators fed from the internal feedback chain. ECN00-1346 © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1153 Ref. MS-013AC 7 ...

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